library/smarty/libs/plugins/function.math.php
author Markus Bröker <broeker.markus@googlemail.com>
Fri, 13 Nov 2015 22:14:54 +0100
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Setup Dateien und initiales Datenbank Layout
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<?php
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/**
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 * Smarty plugin
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 * This plugin is only for Smarty2 BC
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 *
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 * @package    Smarty
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 * @subpackage PluginsFunction
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 */
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/**
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 * Smarty {math} function plugin
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 * Type:     function<br>
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 * Name:     math<br>
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 * Purpose:  handle math computations in template
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 *
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 * @link     http://www.smarty.net/manual/en/language.function.math.php {math}
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 *           (Smarty online manual)
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 * @author   Monte Ohrt <monte at ohrt dot com>
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 *
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 * @param array $params parameters
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 * @param Smarty_Internal_Template $template template object
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 *
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 * @return string|null
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 */
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function smarty_function_math($params, $template) {
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    static $_allowed_funcs = array(
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        'int' => true, 'abs' => true, 'ceil' => true, 'cos' => true, 'exp' => true, 'floor' => true,
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        'log' => true, 'log10' => true, 'max' => true, 'min' => true, 'pi' => true, 'pow' => true,
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        'rand' => true, 'round' => true, 'sin' => true, 'sqrt' => true, 'srand' => true, 'tan' => true
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    );
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    // be sure equation parameter is present
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    if (empty($params['equation'])) {
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        trigger_error("math: missing equation parameter", E_USER_WARNING);
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        return;
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    }
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    $equation = $params['equation'];
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    // make sure parenthesis are balanced
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    if (substr_count($equation, "(") != substr_count($equation, ")")) {
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        trigger_error("math: unbalanced parenthesis", E_USER_WARNING);
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        return;
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    }
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    // match all vars in equation, make sure all are passed
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    preg_match_all("!(?:0x[a-fA-F0-9]+)|([a-zA-Z][a-zA-Z0-9_]*)!", $equation, $match);
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    foreach ($match[1] as $curr_var) {
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        if ($curr_var && !isset($params[$curr_var]) && !isset($_allowed_funcs[$curr_var])) {
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            trigger_error("math: function call $curr_var not allowed", E_USER_WARNING);
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            return;
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        }
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    }
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    foreach ($params as $key => $val) {
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        if ($key != "equation" && $key != "format" && $key != "assign") {
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            // make sure value is not empty
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            if (strlen($val) == 0) {
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                trigger_error("math: parameter $key is empty", E_USER_WARNING);
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                return;
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            }
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            if (!is_numeric($val)) {
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                trigger_error("math: parameter $key: is not numeric", E_USER_WARNING);
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                return;
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            }
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            $equation = preg_replace("/\b$key\b/", " \$params['$key'] ", $equation);
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        }
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    }
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    $smarty_math_result = null;
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    eval("\$smarty_math_result = " . $equation . ";");
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    if (empty($params['format'])) {
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        if (empty($params['assign'])) {
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            return $smarty_math_result;
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        } else {
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            $template->assign($params['assign'], $smarty_math_result);
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        }
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    } else {
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        if (empty($params['assign'])) {
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            printf($params['format'], $smarty_math_result);
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        } else {
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            $template->assign($params['assign'], sprintf($params['format'], $smarty_math_result));
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        }
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    }
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}